#709[???] Datasheet parsing for bit fields

Similar thing has to be implemented for intel/amd docs, in order to use eg. bincfg on register dumps, so regressions on real machines can be tracked before they add up to machine visibly keeling over. This is a necessary step to achieve true continuous integration for libreboot supported systems.

Existing successful Radeon attempt:
* https://edwardbetts.com/ati_pdf/
* https://edwardbetts.com/ati_pdf/ati_pdf.html
Similar thing has to be implemented for intel/amd docs, in order to use eg. bincfg on register dumps, so regressions on real machines can be tracked before they add up to machine visibly keeling over. This is a necessary step to achieve true continuous integration for libreboot supported systems.